Valve-gear for internal-combustion engines



N. J. LE GRANDE.

A vALvE GEAR FoR INTERNAL coNusTloN ENGINES.

APPLICATION FILED FEB. I4, 1919.

Patented June 29, 1920.

narran STATES avion-OLAS J-. ,LEY GRANDE,

PATENT OFFICE.

or GOODWIN,y ARKANSAS. I

VALVE-GEAR FOR `INTIERN'AL-COIVIBUS'IJCON ENGINES.

Specification of Letters Patent.

Patented lJane 29, 1929.

Application filed February 14, 19,19. Serial NO.- 976,939,

,To all 107mm t may concern.'

Gears for Internal-Combustion"Engines, of

which the following is a specification.'A

This invention relates to improvements 1n valve gears for internal combustion engines, and has as its special objectthe provision of a novel and efficient type of-valve operating means, the same being so arranged that the cylinder head can be removed intact, together with the valve operating mechanism carried thereby, thereby allowing access to the cylinders in a ready manner. f

A further object is to provide means whereby,.should wear occur to the valves or valve seats, th'at the same can be readily renewed and without a heavy expense.r y

V'These and other like objects, which will become more fully manifest as the description progresses, are attained by thenovel construction and combination of parts hereinafter described and shown in the accompanying drawings, fo-rmingfafmaterial part of this disclosure, and in which Figure l is av fragmentary fvertical sectional view taken Substantially through the center of a conventional type of explosion engine, Vand indicating the application of the invention;

Fig. 2 is an enlarged fragmentary sectional view, ofthe same, and l Fig. 3 is a transverse sectional view taken on line of Fig.2, drawn to a further enlarged scale. 1

In the drawings the numeral 10 indicates a hollow frame or casing, provided with enlarged bosses, 11, acting as bearings for the shaft 12,`which is freely journaled therein, the ends of the shaft being rotatable `in outhoardsupports 14, adjacent to which is secured a drivewheel 15, `from which power may be taken.

A central support 16, for the shaft is carried on a bar 17, which passes transversely through the casing near its center.

A cover plate 20, is formed with downwardly extending flanged sides 21, the outturned edges 22 of which are secured upon similarly Outturned edges 23, formed with casing.

errang-ed internally of the casing 10, at

'theupper end, and projecting into the cover 20, Vare pairs of cylinders 25 and25, and 26 and 2 6 in which operate pistonsy 27 and 27 and 2S and 28', the same being connected by piston rods 29 pivotedly engaged Within the pistons in the usual manner at one end,

and connecting with the cranks 30'and 30v and y3l and 31 formed with the shaft 12.

Secured on top of the covered casing 20, arehollow rectangular casings 35, having flanged bases 36, and formed with the casings are tubular sleeve guides 37, terminating "in enlarged heads 38, from which project vupwardbracket elements 39, their front horizontally extending portions constituting guides 40 being in register with the heads 38, Valves 42, having stems 43, guided in the sleeves 37, enter the cylinders, the same seating against conical openings 44', formed in the lower vside ofv circular blocks 45, the blocks having extending flanges 46, suited to be received in counter-bore openingsV formed in the cover 20, which acts as fthe head of the cylinders. j

These blocks are normally held in position by the flanges 36, of the casing 35, but Obviously may be removed therefrom when wear occurs by releasing the casings 35, and new blocks substituted containing 4similar valve seats. Collars 48 are fixed to the valve stems to prevent them dropping completely into the cylinders when the valve head is removed.

These valves are held normally against their seats by means ofcoiled compression springs 49, surrounding the upper ends of the vvalve stems and bearing between the heads 3S and collars 52 secured by screws 51 onthe projecting upper ends of the valve stems. These collars are formedwith convex Y upper surfaces 53, the same being pressed upward by the springs 49 so as to make contact with the lower curved surface 55, of forks 56, having between them spaces 57 through which extend the rods 50.

These forks are integrally formed with levers 60, Aextending diagonally downward,

and pivoted on screws 61, setV in the brackets 62, fixed securely upon the outer surface of the cover plate 20. The oppositely extending downward ends of the levers 60, are also forked and carry pins 63, upon which are rotatably mounted rollers 64, impinging against the surface of cams 65, mounted at suitable spaced intervals` onv a yshaft 66, carried in bearings'?, extending outwardly at the rear of the engine casing 10, said brackets are provided with removable caps 68, so that the shaft, together with the cams, may be readily removed when desired.

Rotary motion is communicated to the shaft 66, by reason of a bevel gear 70, fixed upon one of its extending ends, the gear meshing with a mating gear 71, fixed upon the upper end of a vertical shaft 7 2, guided in a bracket 7 3, near its upper end, the same being attached to the end of the casing 10, while the lower end of the shaft passes through a similar bearing 74, extending from van arm 75 formed with the outboard support 17. Y

Attached below the bearing 74, upon the vertical shaft 72, is another bevel gear 77,

meshing with a mating gear 78, secured upon Y the sha-ft 12," exterior of the bearing 11. Thus, when the engine is operated, rotary motion is conveyed to the shaft 66, causing the cams 65 toy rotate and transmit reciprocating motionthrough the levers 60 to the rods 50, which, pressing upon the valve stems 53, open the valves at proper intervals, their closing being effected by the springs 49. In this type of vengine it iscustomary to use separate inlet Vand exhaust valves lfor each of the several cylinders, all of which are timed and operated in the usual manner. Theintake and exhaust manifoldsare indicated 8Oy and 181 respectively in F ig. 2.

From the foregoing it will be obvious that by disassociating the cover 20, the several valves and all of -their attached vparts, in-

' cluding the nieansvby which they are operated, can be removed intact from the casing so that access maybe had to the cylinder in :an unusually easy and convenient manner.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is z- .1. In a valve gear for internal combustion engines, the combination with a casing, and a `cover secured thereto, of a plurality of vcylinders formed with said casing extending to said cover, said cover forming the head of said cylinders, pairs of valves extending through said cover into each of said cylinders in a direction parallel to the axes of the latter, said valves being all in alinement longitudinallyof the engine, removable seats against which said valves `make contact, means pressing said valves into engagement with said seats, levers pivotally Vmounted on said coverand extending diagonally downward across said cover, said' levers being adapted to operate 'said valves, a y

plurality of cams, one for each of said levers, a horizontal shaft mounted at the rear of said cover, upon which said cams are secured, and means for rotating said `shaft from the shaft of said engine.

2. In a valve gear for internal combus- Y tion engines, comprising a casing containing cylinders, a cover common to all of said cylinders, a horizont-al shaft, and means for driving said shaft from the shafty of said engine, of a pair 'of'v'alves for each cylinder,

a plurality'of cams secured on said shaft,

levers mounted upon the cylinder cover, rollers in said levers contactable with said cams, interchangeable blocks having seats against which said valves contact, means for Ynormally holding said valves against said seats, sleeves rigid upon said cover adapted to guide the stems of said valve, rods slidable in said sleeves adapted to make contact with the ends of said valve stems, collars adjustably engaged withV said rods, forks formed in the upper ends of said levers adapted to make contact with said collars whereby said valves may be opened, and

spring means in said sleeves adapted to the head of said cylinders, of a pair :of valves extending through said cover for each of lsaid cylinders, stems formed with ksaid valves, rigid guidesfor said stems, means for holding said valves in a normally closed position, rods slidably mounted in said guides, said rods being adapted tov make Icontact with the upper ends of `said valve stems, an ladjustable collar secured to `said valve stems, forked levers eugageable with said collars, said levers being fulcrumed on the upper part of said casing cover, aplurality of cams, one for each o f 'said valves, said cams being operative with respect to said levers, and means for communicating rotary motion to said shaft. 'Y Y In testimony` whereof I have 4aiiixed my signature.

'NICHOLAS J. GRANDE. 

